<?php

function parseBitset ($bitset) {
    $bin = str_repeat("0", 24 - strlen(decbin($bitset))) . decbin($bitset);

    $sharedMemory = bindec(substr($bin, 0, 2));
    $median = substr($bin, 2, 1) !== "0";
    $little = bindec(substr($bin, 3, 2));
    $protector = substr($bin, 5, 1) !== "0";
    $fictive = substr($bin, 6, 1) !== "0";
    $notTalking = substr($bin, 7, 1) !== "0";
    $host = substr($bin, 8, 1) !== "0";
    $robot = substr($bin, 21, 1) !== "0";
    $species1 = substr($bin, 9, 4);
    $species2 = substr($bin, 13, 4);

    $species1 = match ($species1) {
        "0001" => "earth",
        "0010" => "unicorn",
        "0011" => "pegasus",
        "0100" => "alicorn",
        "0101" => "batpony",
        "0110" => "crystal",
        default => null,
    };

    $species2 = match ($species2) {
        "0001" => "earth",
        "0010" => "unicorn",
        "0011" => "pegasus",
        "0100" => "alicorn",
        "0101" => "batpony",
        "0110" => "crystal",
        default => null,
    };

    return [
        'shared_memory' => $sharedMemory,
        'median' => $median,
        'protector' => $protector,
        'fictive' => $fictive,
        'little' => $little,
        'not_talking' => $notTalking,
        'host' => $host,
        'robot' => $robot,
        'species' => array_filter([
            $species1,
            $species2
        ], function ($i) {
            return isset($i);
        })
    ];
}

function parseMetadata ($metadata) {
    if (isset($metadata)) {
        if ($metadata["bitset"]) {
            $m = parseBitset($metadata["bitset"]);
            $m["marefriends"] = $metadata["marefriends"] ?? [];
            $m["bitset"] = $metadata["bitset"] ?? [];
            $m["sisters"] = $metadata["sisters"] ?? [];
            $m["regression"] = $metadata["regression"] ?? null;
            $m["caretakers"] = $metadata["caretakers"] ?? [];
            $m["median"] = $metadata["median"] ?? null;
        } else {
            $m = $metadata;
        }

        return $m;
    } else {
        return $metadata;
    }
}